package com.sky.service.common.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.RedisConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.common.CategoryMapper;
import com.sky.mapper.common.DishMapper;
import com.sky.mapper.common.SetmealMapper;
import com.sky.pojo.Category;
import com.sky.result.PageResult;
import com.sky.service.common.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 分类业务层
 */
@Service
@Slf4j
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;



    /**
     * 新增分类
     * @param categoryDTO
     */
    public void save(CategoryDTO categoryDTO) {
        Category category = new Category();
        //属性拷贝
        BeanUtils.copyProperties(categoryDTO, category);
        //设置时间和操作人
        category.setCreateTime(LocalDateTime.now());
        category.setUpdateTime(LocalDateTime.now());
        category.setCreateUser(BaseContext.getCurrentId());
        category.setUpdateUser(BaseContext.getCurrentId());
        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);
        categoryMapper.insert(category);
        //   将缓存数据 清理
        redisTemplate.delete(RedisConstant.CATEGORY_CACHE_PREFIX+categoryDTO.getType());
    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
        //下一条sql进行分页，自动加入limit关键字分页
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
        Integer count = dishMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
        count = setmealMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
        //   将缓存数据 清理
        //redisTemplate.keys("category:*");
        // redisTemplate.delete(RedisConstant.CATEGORY_CACHE_PREFIX+categoryDTO.getType());
    }

    /**
     * 修改分类
     * @param categoryDTO
     */
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        //设置修改时间和修改人
        category.setUpdateTime(LocalDateTime.now());
        category.setUpdateUser(BaseContext.getCurrentId());
        BeanUtils.copyProperties(categoryDTO,category);
        categoryMapper.update(category);
        //   将缓存数据 清理
        redisTemplate.delete(RedisConstant.CATEGORY_CACHE_PREFIX+categoryDTO.getType());

    }

    /**
     * 启用、禁用分类
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        Category category = Category.builder()
                .id(id)
                .status(status)
                .updateTime(LocalDateTime.now())
                .updateUser(BaseContext.getCurrentId())
                .build();
        categoryMapper.update(category);


    }

    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 根据类型查询分类
     * @param type =1  菜品分类    type= 2  套餐分类
     * @return
     */
    public List<Category> list(Integer type) {
        //1.先从redis获取数据
        long t1 = System.currentTimeMillis();
        List<Category> categoryList = (List<Category>)redisTemplate.opsForValue().get(RedisConstant.CATEGORY_CACHE_PREFIX + type);
        long t2 = System.currentTimeMillis();
        //2.如果没有拿到数据，从数据库获取，并且保存到redis中
        if(categoryList==null||categoryList.size()==0){
            System.out.println("**********从数据库获取数据**********");
            categoryList = categoryMapper.list(type);
            redisTemplate.opsForValue().set(RedisConstant.CATEGORY_CACHE_PREFIX+type,categoryList);
        }else {
            System.out.println("*********从redis获取数据*********："+(t2-t1));
        }
        return categoryList;
    }
}
